What is a StringBuilder in Java?

What is a StringBuilder in Java?

A StringBuilder in Java is a mutable sequence of characters, which means you can modify it without creating new objects.

How does it differ from String?

Unlike String, which is immutable, StringBuilder allows for dynamic modification of strings, making it more efficient for concatenation.

Can you show me an example of using StringBuilder?

Sure! Here's a simple example:

StringBuilder sb = new StringBuilder();
sb.append("Hello");
sb.append(" World!");
System.out.println(sb.toString());

This will output 'Hello World!'.

When should I use StringBuilder instead of String?

You should use StringBuilder when you need to perform many string manipulations, like concatenation in loops, to improve performance.